In-service training statistics: documentation of statistics

In these statistics, residential buildings refer to the main categories of Residential buildings (A) and Free-time residential buildings (B) in Statistics Finland's classification of buildings. These are divided into the following sub-categories:
- detached houses: one and two-dwelling houses, semi-detached houses and other detached and semi-detached houses.
- terraced houses: rowhouses, terraced houses and other attached houses
- blocks of flats: balcony-access blocks and houses with at least three dwellings of which at least two are on top of each other.
- free-time residential buildings: detached summer cottages or free-time residences mainly intended for private use.